+void
+Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
+{
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), i);
+ me->add_dependency (i);
+}
+
+
+
+
+
+ADD_INTERFACE (Separating_group_spanner,"separation-spanner-interface",
+ "Spanner that containing @code{separation-item-interface} grobs to calculate rods",
+ "");